Privacyst is a simple Google Chrome Extension which detects and block third-party trackers. When Privacyst intercepts a request to a third party-domain, it analyzes it and tags it as follows. Blocked - The request domain was recognized as a tracker and it was blocked. Cookies - The request domain was found in yellow list. This list allows requests to third-party domains only for functionality purposes. Cookie, Referer and Set-Cookie headers are deleted before sending the request or receiving the response. Allowed - The request domain was analyzed and it was allowed. Privacyst permits to disable the extension on any web site and offers an options page for managing it.